Chuck for chucking a small bit and table drill with the same

ABSTRACT

A chuck for holding a small bit and used with a table drill is provided for drilling a millipore. The chuck includes a holding jaw having four holders; a jaw-positioning guiding body with a square hole at the front portion for positioning the holding jaw; a crossing linkage for connecting the body to the jaw and having a crossing head and a project between which a groove is formed; a guiding jacket matched with the crossing linkage and the body; a positioning screw nut matched with the jaw-position guiding body; a screw collar matched with the crossing linkage; and a bevel gear housing housed around the screw collar for fixing it.

FIELD OF THE INVENTION

[0001] The present invention relates to a chuck and apparatus equipped with the same used in mechanical process, in particular, to a chuck and a table drill with the same for drilling a Millipore.

BACKGROUND OF THE INVENTION

[0002] Conventional cutters used in a drilling machine, a turning machine, a milling machine, a boring machine and a digitally controlled machine have three jaws. Those table drills specialized in drilling usually adopt the conventional three-jaw cutters to perform conventional process. The operator can directly control the depth and length of drilling by using the handle. The stronger the force is applied to the handle, the stronger the pressure is applied to a workpiece to be processed. The above operation is effective for the conventional process. However, when the process needs higher precision such as drilling a pore having a diameter less than 0.2 mm, the conventional operation cannot be performed correctly.

[0003] The reasons are as follows: (1) The conventional three-jaw chuck cannot hold a small bit. Even if the bit is held, it is hard to ensure the bit in a correct position. Once a bit is in a position deviated from the center, the bit will be broken when it rotates in high speed. (2) Since the feed of a cutter is manually operated by an operator, it is hard to actually control the feed and the depth of the cutter. In fact, people have more or less such an experience that when a bit contacts the workpiece, the bit will be broken once a force is applied thereto. Thus, it is difficult to drill a millipore with a diameter equal to or less than 0.2 mm for workpieces used in the field of machining, electronic engineering, automobile manufacturing, clock/watch production, laser device, computer and aerospace.

SUMMARY OF THE INVENTION

[0004] An object of the invention is to provide a flexible and reliable chuck, which comprises:

[0005] a holding jaw comprising four holders;

[0006] a jaw-positioning guiding body with a square hole at the front portion for positioning the holding jaw;

[0007] a crossing linkage for connecting the jaw-positioning guiding body to the holding jaw, comprising a crossing head and a project between which a groove is formed;

[0008] a guiding jacket matched with the crossing linkage and the jaw-positioning guiding body;

[0009] a positioning screw nut matched with the jaw-position guiding body;

[0010] a screw collar matched with the crossing linkage; and

[0011] a bevel gear housing housed around the screw collar for fixing it.

[0012] Another object of the present invention is to provide a table drill for drilling a millipore, which comprises:

[0013] a base;

[0014] a column standing on the base; and

[0015] a composite body arranged on the column, comprising a motor, a chuck for chucking a small twist dill, a drilling spindle, and controlling means for controlling the drilling spindle to move upwards and downwards and automatically adjusting the pressure applied to the bit.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016]FIG. 1 shows schematically a table drill according to the invention;

[0017]FIG. 2 is a top view of the chuck cross section of the table drill as shown in FIG. 1;

[0018]FIG. 3 shows schematically a gearbox according to the invention;

[0019]FIG. 4 shows schematically a linkage box according to the invention;

[0020]FIG. 5 is to illustrate schematically the structure of a chuck according to the invention;

[0021]FIG. 6 is to illustrate schematically the structure of the bevel gear house according to the invention;

[0022]FIG. 7 is to illustrate schematically the structure of a jaw-position guiding body according to the invention;

[0023]FIG. 8 is to illustrate schematically the structure of a guiding jacket according to the invention;

[0024]FIG. 9 is to illustrate schematically the structure of a positioning screw nut according to the invention;

[0025]FIG. 10 is to illustrate schematically the structure of a crossing linkage according to the invention;

[0026]FIG. 11 is to illustrate schematically the structure of a screw collar according to the invention;

[0027]FIG. 12 is to illustrate schematically the structure of a holder according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] A chuck for chucking a small bit according to the invention comprises:

[0029] a holding jaw comprising four holders;

[0030] a jaw-positioning guiding body with a square hole at the front portion for positioning the holding jaw;

[0031] a crossing linkage for connecting the jaw-positioning guiding body to the holding jaw, comprising a crossing head and a project between which a groove is formed;

[0032] a guiding jacket matched with the crossing linkage and the jaw-positioning guiding body;

[0033] a positioning screw nut matched with the jaw-position guiding body;

[0034] a screw collar matched with the crossing linkage; and

[0035] a bevel gear housing housed around the screw collar for fixing it.

[0036] Said holder is of an identical triangular bar in which two planes are vertical with each other and the third plane comprises a guiding track, and has a notch at the end thereof.

[0037] In the invention, a flume is formed on an inner wall of the square hole, an outer screw thread is formed on the outer surface at the rear portion of the jaw-positioning guiding body, and first four axial guiding areas are formed at the rear portion of the jaw-positioning guiding body.

[0038] Said crossing linkage is connected to the body by inserting four tips of the crossing linkage into said first four axial guiding areas formed in the jaw-positioning guiding body.

[0039] Said guiding jacket has four flumes on the inner wall, and second four axial guiding areas at the front portion where the four tips of the crossing linkage are inserted and the second four axial guiding areas are further inserted into the guiding areas of the jaw-position guiding body.

[0040] Said notch is matched with said project in the crossing linkage.

[0041] The invention also provides a table drill for drilling a millipore, which comprises:

[0042] a base;

[0043] a column standing on the base; and

[0044] a composite body arranged on the column, comprising a motor, a chuck for chucking a small twist dill, a drilling spindle, and controlling means for controlling the drilling spindle to move upwards and downwards and automatically adjusting the pressure applied to the bit.

[0045] Said controlling means comprises:

[0046] a horizontal axis;

[0047] a gearbox jacketing the horizontal axis, at one end of which a first block is formed;

[0048] a linkage box comprising a second block at one end corresponding to the first block of the gearbox;

[0049] a handle disposed on the other end of the linkage box; and

[0050] a spring positioned between the first block and the second block.

[0051] The present invention will now be described in detail in combination with the drawings.

[0052]FIG. 1 shows a table drill according to one preferred embodiment of the invention. Similar to those of the conventional, the table drill includes a base 1, a column 2 standing on the base 1, a composite body 3 arranged on the upper portion of the column 2 comprising a motor 4, a chuck 14 being capable of fixing a small bit and a controlling means 6 for moving the main-axis 5 upwards and downwards and adjusting automatically the pressure applied to a workpiece by the bit.

[0053] Referring to FIG. 2 as well as FIG. 3 and FIG. 4, the controlling means 6 comprises a gearbox 8 and a linkage box 9. The gearbox 8 jackets a horizontal axis 7 and one end of the gearbox 8 has a first block 12. The linkage box 9 is set at one end of the horizontal axis 7 and is provided with a second block 13 at one end of the linkage box 9 corresponding to the first block 12. A handler 10 is arranged on another end of the linkage box 9. A spring 11 is inserted between the blocks 12 and 13. By means of the buffering of the spring 11, the pressure applied to a workpiece by the bit may be automatically adjusted so as to prevent the bit from being broken when contacting the workpiece.

[0054]FIG. 5 shows the structure of the chuck 14, comprising a bevel gear house 15, a jaw-position guiding body 16, a screw collar 17, a holding jaw 19 including four identical holders 18, a crossing linkage 24, a guiding jacket 30 and a positioning screw nut 35.

[0055] From FIG. 7, it is seen that the front portion of the jaw-position guiding body 16 is formed as a square hole and each inner wall 21 of the square hole has a flume 22. A plurality of screw threads 34 are formed on the outer surface of the rear portion of the jaw-position guiding body 16 and first four guiding areas 29 are axially formed thereon. The holding jaw 19 including four holders 18 is arranged in the square hole. Referring to FIG. 12, the holders 18 are formed in shape of a triangle bar, in which two planes 20 which are vertical to each other are matchable and the third plane is provided with a guiding track 23. The rear portion of each holder 18 is provided with a notch 25. FIG. 10 shows schematically the crossing linkage 24, comprising a crossing head and a groove 26 both of which are formed integrally. Four tips 27 of the crossing head are positioned in the same cylinder and are provided with outer screw threads 28. The four tips 27 are engaged with the first four guiding areas 29 of the jaw-position guiding body 16, respectively, and the outer screw threads 28 matches with the screw-collar 17 as shown in FIG. 11. The groove 26 formed on one side of the crossing head is able to match with the notch 25 of the holder 18. The rear portion of the jaw-position guiding body 16 is inserted into a guiding jacket 30. FIG. 8 shows the jacket 30, in which second four guiding areas 31 are formed at the front portion thereof so as to match with the four tips 27 of the crossing head and to insertably match with the first four guiding areas 29 of the jaw-position guiding body 16. The inner wall of the front portion of the jacket 30 are provided with four flumes 33 which form a composite guiding mechanism in combination with the flumes 22 so as to correspond to the guiding track 23. The guiding track 23 may be movable in the composite guiding mechanism formed by flumes 33 and 22. As shown in FIG. 9 and FIG. 5, the rear end of the chuck 14 is provided with a positioning screw nut 35 which matches with the outer screw threads 34 for preventing the jacket 30 from dropping off. As shown in FIG. 5 and FIG. 6, an aperture 37 is formed on an appropriate portion of the jaw-position guiding body 16 for accommodating a lockpin that matches with the bevel gear of a bevel gear housing 15. With a structure similar to a conventional bevel gear housing, the bevel gear housing 15 of the present invention jackets tightly the screw collar 17. When a bit is held or loosened, the lockpin can be inserted into the aperture 37 and the bevel gear house 15 can rotate the screw collar 17. The screw collar 17 matches with the outer screw threads 28 formed on the tips 27 of the crossing head so that the crossing linkage 24 can be movable axially along the guiding mechanism consisting of the jaw-position guiding body 16 and the post-positioning guiding jacket 30. Four holders 18 are hanged on the groove 26 through the notch 25 and the guiding track 23 matches with the guiding mechanism consisting of flumes 22 and 33 so as to flap/loose the holding jaw 19.

[0056] Thanking for the scientific and reasonable design, the structure of the present invention can overcome various defects existing in the prior art and be used for holding various cutters of drilling machines turning machines, milling machines, boring machines, or digitally controlled machines. It can hold not only those cutters having round handles in various sizes, but also those cutters having square handles. The table drill for drilling a millipore according to the invention can hold the small bit having a diameter equal to or less than 0.2 mm and can prevent the bit from being broken when contacting the workpiece. It can be widely used in various fields where precise process is needed. 

What I claim is:
 1. A chuck for chucking a small bit comprising: a holding jaw comprising four holders; a jaw-positioning guiding body with a square hole at the front portion for positioning the holding jaw; a crossing linkage for connecting the jaw-positioning guiding body to the jaw, comprising a crossing head and a project between which a groove is formed; a guiding jacket matched with the crossing linkage and the jaw-positioning guiding body; a positioning screw nut matched with the jaw-position guiding body; a screw collar matched with the crossing linkage; and a bevel gear housing housed around the screw collar for fixing it.
 2. A chuck according to claim 1 , wherein said holder is of a triangular bar in which two planes are vertical with each other and the third plane comprises a guiding track, and has a notch at the end thereof.
 3. A chuck according to claim 1 , wherein a flume is formed on an inner wall of the square hole, an outer screw thread is formed on the outer surface at the rear portion of the jaw-positioning guiding body, and first four axial guiding areas are formed at the rear portion of the jaw-positioning guiding body.
 4. A chuck according to claim 3 , wherein said crossing linkage is connected to the jaw-positioning guiding body by inserting four tips of the crossing linkage into said first four axial guiding areas formed in the jaw-positioning guiding body.
 5. A chuck according to claim 4 , wherein said guiding jacket have four flumes on the inner wall, and second four axial guiding areas at the front portion where the four tips of the crossing linkage are inserted and the second four axial guiding areas are further inserted into the guiding areas of the jaw-position guiding body.
 6. A chuck according to claim 2 , wherein said notch is matched with said project in the crossing linkage.
 7. A table drill for drilling a millipore comprises: a base; a column standing on the base; and a composite body arranged on the column, comprising a motor, a chuck for chucking a small twist dill, a drilling spindle, and controlling means for controlling the drilling spindle to move upwards and downwards and automatically adjusting the pressure applied to the bit.
 8. A table drill according to claim 7 , wherein said controlling means comprises: a horizontal axis; a gearbox jacketing the horizontal axis, at one end of which a first block is formed; a linkage box comprising a second block at one end corresponding to the first block of the gearbox; a handle disposed on the other end of the linkage box; and a spring positioned between the first block and the second block.
 9. A table drill according to claim 7 , wherein the chuck comprises: a holding jaw comprising four holders; a jaw-positioning guiding body with a square hole at the front portion for positioning the holding jaw; a crossing linkage for connecting the jaw-positioning guiding body to the holding jaw, comprising a crossing head and a project between which a groove is formed; a guiding jacket matched with the crossing linkage and the jaw-positioning guiding body; a positioning screw nut matched with the jaw-position guiding body; a screw collar matched with the crossing linkage; and a bevel gear housing housed around the screw collar for fixing it.
 10. A table drill according to claim 9 , wherein said holder is of a triangular bar in which two planes are vertical with each other and the third plane comprises a guiding track, and has a notch at the end.
 11. A table drill according to claim 9 , wherein a flume is formed on an inner wall of the square hole, an outer screw thread is formed on the outer surface at the rear portion of the jaw-positioning guiding body, and first four axial guiding areas are formed at the rear portion of the jaw-positioning guiding body.
 12. A table drill according to claim 11 , wherein said crossing linkage is connected to the jaw-positioning guiding body by inserting four tips of the crossing linkage into said first four axial guiding areas formed in the jaw-positioning guiding body.
 13. A table drill according to claim 12 , wherein said guiding jacket has four flumes on the inner wall, and second four axial guiding areas at the front portion where the four tips of the crossing linkage are inserted and the second four axial guiding areas are further inserted into the guiding areas of the jaw-position guiding body.
 14. A table drill according to claim 10 , wherein said notch is matched with said project in the crossing linkage. 